Transverse spin dependent azimuthal asymmetries at COMPASS

Transverse spin dependent azimuthal asymmetries at COMPASS
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COMPASS 处横向自旋相关的方位不对称性

DOI:
10.1088/1742-6596/295/1/012046
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发表时间:
2010
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
B. Parsamyan
B. Parsamyan
中科院分区:
--
文献类型:
--
作者:
B. Parsamyan

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在极化轻子在横向极化目标上的半包容深度非弹性散射中,允许八个目标横向自旋相关的方位调制。在QCD部分子模型中,这些不对称性中的一半可以在前序方法中得到解释,另外四个是扭曲三贡献。由Hermes和Compass实验提取的前两个主要的扭转不对称性与横向分布和Collins效应有关,另一个与Sivers分布函数有关。这些结果在过去的几年里引起了人们的极大兴趣,并使得首次提取核子的横截面和Sivers分布函数成为可能。剩下的六个不对称性是通过使用160GeV/c纵向极化的µ子束和横向极化的氘和质子靶进行的COMPASS实验获得的。这里我们回顾了2007年COMPASS质子数据的初步结果。
In the semi-inclusive deep inelastic scattering of polarized leptons on a transversely polarized target eight target transverse spin-dependent azimuthal modulations are allowed. In the QCD parton model half of these asymmetries can be interpreted within the leading order approach and the other four are twist-three contributions. The first two leading twist asymmetries extracted by HERMES and COMPASS experiments are related: one to the transversity distribution and the Collins effect, the other to the Sivers distribution function. These results triggered a lot of interest in the past few years and allowed the first extractions of the transversity and the Sivers distribution functions of nucleon. The remaining six asymmetries were obtained by the COMPASS experiment using a 160 GeV/c longitudinally polarized muon beam and transversely polarized deuteron and proton targets. Here we review preliminary results from COMPASS proton data of 2007.
DOI: 10.1016/j.physletb.2010.08.001
发表时间: 2010-05
期刊: Physics Letters B
影响因子: 4.4
作者:
T. C. C. A. Alekseev-T.-C.-C.-A.-Alekseev-102393709;E. al.
通讯作者: T. C. C. A. Alekseev-T.-C.-C.-A.-Alekseev-102393709;E. al.
DOI: 10.1103/physrevlett.94.012002
发表时间: 2004-08
影响因子: 8.6
作者:
The Hermes Collaboration
通讯作者: The Hermes Collaboration
DOI: --
发表时间: 2007
期刊: Nuclear Physics B765
影响因子: --
作者:
E. S. Ageev T. Iwata;T. Matsuda N. Horikawa and COMPASS collaboration
通讯作者: T. Matsuda N. Horikawa and COMPASS collaboration